Microsoft XP date?is there such a thing?

Has any Microsoft software ever been released when scheduled? I believe this is where the automatic update is going to come into play. Of course, if I were a hacker, and I wanted to totally destroy 50% of the world’s computers, loading a faulty update that makes the machine blue screen every time it boots into the appropriate update server would be a choice of mine. I guess the world’s just glad I’m not a hacker…